111609457 has 2 divisors, whose sum is σ = 111609458. Its totient is φ = 111609456.

The previous prime is 111609431. The next prime is 111609497. The reversal of 111609457 is 754906111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89415936 + 22193521 = 9456^2 + 4711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111609457 is a prime.

It is not a weakly prime, because it can be changed into another prime (111609497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55804728 + 55804729.

It is an arithmetic number, because the mean of its divisors is an integer number (55804729).

Almost surely, 2^111609457 is an apocalyptic number.

It is an amenable number.

111609457 is a deficient number, since it is larger than the sum of its proper divisors (1).

111609457 is an equidigital number, since it uses as much as digits as its factorization.

111609457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 111609457 is about 10564.5377087689. The cubic root of 111609457 is about 481.4675240406.

The spelling of 111609457 in words is "one hundred eleven million, six hundred nine thousand, four hundred fifty-seven".